Laser-phosphor device with laser array

Abstract

A laser-phosphor device is disclosed wherein laser radiation from a laser array is transmitted via a collimating primary optical unit and via an imaging optical system onto a phosphor layer. The laser arrangement has a plurality of lasers, for example laser diodes. Via the imaging optical system, a reduced imaging of the laser radiation distribution of the primary optical unit is produced on the phosphor layer.

1 . A laser-phosphor device, in which the laser radiation of a laser array can be transmitted via primary optics which collimate the laser radiation and via an optical system onto a phosphor layer, the laser array comprising a multiplicity of lasers, wherein the optical system is configured as an imaging optical system with which a reduced image of a part, passed through by the laser beam, of a plane which extends perpendicularly to the optical axis of the system and lies at least in the vicinity of the primary optics can be generated on the phosphor layer. 
     
     
         2 . The laser-phosphor device as claimed in  claim 1 , wherein the primary optics comprise a multiplicity of converging lenses, and wherein a converging lens is assigned to each laser. 
     
     
         3 . The laser-phosphor device as claimed in  claim 2 , wherein each converging lens comprises two convexly curved surfaces, one of which is aspherical. 
     
     
         4 . The laser-phosphor device as claimed in  claim 1 , wherein the imaging optical system has a first converging lens or first converging lens group and, after this in the beam path, a diverging lens or diverging lens group, and, after this in the beam path, a second converging lens or second converging lens group. 
     
     
         5 . The laser-phosphor device as claimed in  claim 1 , wherein the imaging optical system has a hollow mirror arrangement and a convexly curved mirror. 
     
     
         6 . The laser-phosphor device as claimed in  claim 5 , wherein the multiplicity of lasers are arranged in an annular fashion around the convexly curved mirror. 
     
     
         7 . The laser-phosphor device as claimed in  claim 5 , wherein the imaging optical system is a reflecting telescope. 
     
     
         8 . The laser-phosphor device as claimed in  claim 5 , wherein the hollow mirror arrangement is a concavely curved hollow mirror having a central opening. 
     
     
         9 . The laser-phosphor device as claimed in  claim 5 , wherein the hollow mirror arrangement has a multiplicity of hollow mirrors, a hollow mirror being assigned to each laser. 
     
     
         10 . The laser-phosphor device as claimed in  claim 1 , wherein the optical imaging is slightly defocused. 
     
     
         11 . The laser-phosphor device as claimed in  claim 1 , wherein the multiplicity of lasers of the laser array is a multiplicity of lasers.. 
     
     
         12 . The laser-phosphor device as claimed in  claim 1 , wherein the lasers of the laser array are arranged uniformly.